AU2007203229A1 - Single-pass boiler with control pass - Google Patents
Single-pass boiler with control pass Download PDFInfo
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- AU2007203229A1 AU2007203229A1 AU2007203229A AU2007203229A AU2007203229A1 AU 2007203229 A1 AU2007203229 A1 AU 2007203229A1 AU 2007203229 A AU2007203229 A AU 2007203229A AU 2007203229 A AU2007203229 A AU 2007203229A AU 2007203229 A1 AU2007203229 A1 AU 2007203229A1
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- Prior art keywords
- pass
- flue gas
- control
- reheater
- boiler
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/001—Controlling by flue gas dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/04—Controlling superheat temperature by regulating flue gas flow, e.g. by proportioning or diverting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
Description
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant(s): Hitachi Power Europe GmbH Invention Title: Single-pass boiler with control pass The following statement is a full description of this invention, including the best method for performing it known to me/us: 2 Single-pass boiler with control pass The invention relates to a single-pass boiler with a flue gas duct arranged above the heat-exchange surface, said flue gas CI duct being preferably designed as a cross-pass at least in O certain sections, with a connected flue gas pipe and with at least one dividing wall arranged above the furnace in the flue gas pass and extending into the area of the flue gas duct, which delimits at least one control pass with at least one associated control valve. In addition, the invention relates to a procedure to control the temperature of the steam exhaust temperature of the reheater heating surface by trimming the flue gas mass flow of a flue gas pass above the furnace of a single-pass boiler.
In principle, two different designs of steam boilers for steam power stations are known. Firstly, there is the single-pass boiler. In a single-pass boiler, the heating surfaces (furnace, superheater, reheater, economiser) are arranged one above the other as heat exchanger bundles in a vertical flue gas pass. The burners which generate hot flue gas by combustion of a fuel are arranged in the lower area (furnace) of the single-pa'ss boiler.
The hot flue gas flows in a single-pass boiler from the bottom upwards through heat-exchange surfaces, which causes it to cool down and leave the boiler at its highest point through a flue gas duct. Depending on the design of the steam power station the heat-exchange surfaces are subdivided into different pressure stages, e.g. high-pressure stage superheater, medium-pressure stage reheater. The different superheater and reheater stages are above the furnace and arranged above one another in a single-pass boiler. At the upper end of the single-pass boiler, before the flue gas leaves the single-pass boiler, an economiser is usually arranged.
N,\Melbourne\Casea\Patent\72000-72999\P72354.AU\Speci 8 \P72354.AU. GH SPECIFICATIONdoc 11/07/07 3 Secondly, the classical two-pass boiler is known. The two-pass boiler contains two flue gas passes and also consists of the components of a furnace, heat exchanger bundles with different superheater and reheater stages and an economiser. The burners of the boiler are arranged in the lower area (furnace) of the boiler in the first flue gas pass. This means that flue gas in 1 the furnace (first flue gas pass) of a two-pass boiler flows upwards, as in a single-pass boiler, but is then diverted at the furnace exhaust via a cross-pass into a second flue gas pass pointing downwards. In a two-pass boiler, the heat exchanger bundles are arranged in the cross-pass and in the second flue gas pass through which the flue gas flows downwards. Along its path, the flue gas is fed through the different stages of the heat exchanger bundles and is therefore cooled down. In the twopass boiler, the different superheater and reheater stages are also arranged in succession along the flue gas path.
Both in a single-pass boiler and in a two-pass boiler, it is known that the flue gas flow can be subdivided into adjacently arranged flue gas flows longitudinally to the flue gas path along the different heat exchanger bundles, and, with the aid of control valves, the individual flue gas flows can be controlled separately so as to form control passes. By way of example, a control pass is used to control the steam exhaust temperature of the reheater heating surfaces at peak load and in the part-load range and set it to a constant temperature, thus avoiding a reheater injection in the upper load range. In this way, the efficiency level of the overall system is increased. With the aid of a control pass, it is possible to compensate without problems for the consequences of different furnace heat absorptions in the reheater heat absorption of the reheater heating surfaces, which may occur, for example, due to the use of different grades of coal or due to changing levels of contamination in the furnace and in the heat-exchange surfaces.
N.\Melbourne\Cases\Patent\72000-7299\P72354.AU\Specis\P72354AU GH SPECIFICATION.doc 11/07/07 4 In two-pass boilers with a control pass, the control valves of the control passes are preferably arranged at the lower end of the second pass, such that, despite the installation of the control valves, the boiler's overall height can remain unchanged, and in particular no change is required to the overall height of the first pass. An example of this type of two-pass boiler with a control pass is known from DE 35 37 749 c) Al.
On the other hand, in single-pass boilers with a control pass, the control valves have until now been arranged above the convection heating surfaces or the heat exchanger bundles, which results in a greater overall height of the boiler compared to single-pass boilers without a control pass. Due to the substantially higher investment costs associated with this, single-pass boilers with a control pass have only occasionally been constructed until now, despite the fact that, in terms of process engineering, single-pass boilers with a control pass present certain advantages over two-pass boilers with a control pass. For instance, single-pass boilers have a slower flue gas velocity .in the bundle range compared to two-pass boilers. In single-pass boilers with a control pass, there is therefore a reduced risk of erosion of the heating surfaces compared to twopass boilers, even in the case of strong trimming of the flue gas quantities. In addition, due to the slower flue gas velocities in the bundle range, single-pass boilers require only small additional flue gas losses for corresponding flue gas quantity trimming in comparison to two-pass boilers.
A single-pass boiler or single-pass steam generator of a generic type is known from EP 0 233 998 Al. This single-pass boiler has a flue gas pass above the furnace, in which superheater surfaces and, at the upper end, an economiser are arranged. Extending into the economiser are dividing walls which, above in the flow direction of the flue gas, have adjustable valves. This makes it possible to subdivide the flue gas pass into three partitions NsVMelbourne\Caaea\Patent\72000-72999\P723S4.AU\Specie\P72354.AU. GH SPECIFICATIONdoc 11/07/07 5 C- and, depending on the position of the control valves, to influence the areas of the economiser swept by the flue gas and the flue gas mass flows into the individual sections. A flue gas duct formed into a cross-pass is connected to the flue gas pass, which then merges into a flue gas pipe. In this single-pass boiler, the control valves are designed as an extension of the c-i dividing walls at the upper end of the boiler body. The O disadvantage of this single-pass boiler is that, with this valve arrangement, no flue gas can be distributed from the side of the exhaust duct turned towards the heating surface sections to the c-i other sections.
A generic single-pass boiler with a dividing wall which forms or partitions off a control pass is also known from DE 31 26 321 Al. In this tower pass above the furnace there is also a flue gas pass which has different heating surfaces, in particular reheater and superheater heating surfaces. The uppermost level in the flow direction, which is arranged below the flue gas duct, is subdivided into a reheater heating surface and an adjacent economiser heating surface on the same level, which are separated by a dividing wall. This dividing wall, with the aid of control valves arranged in the flow direction of the flue gas just in front of the economiser heating surfaces, forms a control pass. This single-pass boiler also has the disadvantage that no flue gas can be distributed from the side of the exhaust duct turned towards the heating surface sections to the other sections. In addition, the arrangement of the control valves underneath the economiser (ECO) leads to a larger overall height of the boiler, since it is not possible to dispense with the equipment or devices usually arranged in this area heating surface cleaning devices, manholes for heating surface inspections, etc.), and space can only be created for the additional control valves by increasing the overall height.
On the other hand, the object of the invention is to devise a solution which permits a single-pass boiler to be equipped with N \Melbourne\Caeoe\Patent72000-72999\ P 7234.Au\spie\P 7235 4.AU. CH SPECIPICATION.doc 11/07/07 6 Sa control pass which, while retaining at least a predominantly unchanged overall height of the boiler, can be designed to permit the temperature control of the steam exhaust temperature of reheater heating surfaces.
In a single-pass boiler of the type described at the beginning, (1 this invention [sic] is solved according to the invention by O having at least one dividing wall which subdivides the flue gas pass into at least two separate control passes, each of which possesses, at least in certain sections, the areas forming the flue gas duct, whereby at least one control pass is allocated to at least one control valve.
Due to this formation of a single-pass boiler, it is possible to selectively control and influence the entire flue gas mass flow arising in the furnace of a single-pass boiler, while also retaining the design and implementation, in particular the dimensions of the single-pass boiler height and the exhaust gas duct height, of a "standard single-pass boiler" without forming a control pass. It is possible to arrange and form the control pass in such a way as to create a high-pressure superheater (HP)/reheater (RH) control pass offering the possibility of controlling the temperature of the steam exhaust temperature of the reheater heating surfaces, which can be influenced and controlled selectively.
The design according to the invention of the temperature control of the steam exhaust temperature of the reheater heating surfaces can be applied to particular advantage if the flue gas pass is subdivided into a high-pressure superheater control pass and a reheater control pass. The invention therefore provides, in an advantageous and appropriate embodiment, that the area having at least one dividing wall in the flue gas pass with high-pressure superheater heating surfaces is separated from the area having reheater heating surfaces with the formation of a high-pressure superheater control pass and a reheater control N.\Melbourne\casea\Patent\72000-72999\P72354.AU\SPC~s\P72354AU GH SPECIFICATION.doc 11/07/07 7 pass, whereby the high-pressure superheater heating surfaces are preferably arranged on the flue gas side exhaust side of the flue gas pass which is turned towards the flue gas duct, and the flue gas duct is divided, at least in certain areas, into a reheater control pass component and a high-pressure superheater control pass component.
(Ni This makes it possible to arrange a control pass in a singlepass boiler for reheater temperature control with a valve and duct arrangement, in which the overall height of the boiler is unchanged or only negligibly changed, and in particular not increased, in comparison to a boiler without a control pass.
This results in the fact that, by means of a cooled dividing wall in the flue gas pass, the high-pressure superheater heating surfaces are separated from the reheater heating surfaces. The dividing wall is continued above the heat-exchange surfaces in the area of the boiler hood, preferably by an uncooled dividing wall. By means of this subdivision of the flue gas pass and a corresponding arrangement of the heat exchange heating surfaces and control valves, a first flue gas pass component is formed, in which high-pressure heat-exchange surfaces are arranged (high-pressure superheater control pass), and a second flue gas -pass component is arranged in the reheater heating surfaces (reheater control pass). Due to this subdivision of the flue gas pass, it is possible, by means of control valves, to subdivide the flue gas mass flow between the high-pressure superheater control pass and the reheater control pass according to the respective operating requirements.
The high-pressure superheater heating surfaces and therefore the high-pressure superheater control pass are preferably arranged according to the invention on the flue gas side exhaust side, .since the flue gas flow is applied in the part-load range in the direction of the flue gas duct. Thus, by arranging the highpressure superheater heating surfaces on the exhaust side, the adjustability of the reheater (RH) temperature of the reheater N \Melbourne\Caees\Patent\72000.72999\P72354.AU\Specie\P7235 4 .AU. GH SPECIPICATION.doc 11/07/07 8 Z heating surfaces is always ensured, even during start up and in the part-load range of the steam generator.
Due to the fact that the flue gas duct is subdivided, at least in certain areas, into a reheater control pass component and a high-pressure superheater control pass component, it is possible that the reheater control pass forms a reheater control pass component and/or the high-pressure superheater control pass forms a high-pressure control pass component, both of which form part of the flue gas duct, and each are equipped with the necessary control valves for trimming the flue gas mass flows in the area of the boiler hood underneath the boiler roof. This means that the overall height of the boiler can be retained, i.e. it can remain at the level of a single-pass boiler without a control pass, and the overall design of the boiler mounting, as known from a single-pass boiler without a control pass, can also be retained. The dividing wall no longer necessarily extends as far as the boiler roof. If, in particular, the flue gas duct and the control valves of the reheater control pass after the exhaust from the heat-exchange surfaces are arranged under the (normal) boiler roof and after the exhaust from the .boiler in the upper part of the flue gas duct, and if the flue gas duct and the control-valves of the high-pressure superheater control pass after the exhaust from the heat-exchanger heating surfaces are arranged below the reheater control pass and after the exhaust from the boiler in the lower part of the flue gas duct, it is possible to retain the overall height of the boiler, i.e. to leave it at the level of a single-pass boiler without a control pass.
However, it is also possible to rotate the dividing wall by 900 in relation to the exemplary embodiment, both in the boiler body and in the flue gas duct. Then the two control pass components in the flue gas duct are next to and adjacent to each other. In this case, the dividing wall formed in the boiler body then extends as far as the boiler roof of the boiler hood.
N,\Melbourne\Cases\Patent\72000-72999\P72354.AU\Specis\P723S4.AU. GH SPECIFICATION.doc 11/07/07 9 By means of this arrangement, the overall design of the boiler mounting, as known from a single-pass boiler without a control pass, can be retained. Here in particular, provision is made for the equipping of a single-pass boiler with a dividing wall built into the upper boiler area, which extends into the outbound flue gas duct and the upper area of the boiler, as well as subdividing the first part of the outgoing flue gas duct into O two flue gas control passes. Both flue gas control passes are preferably equipped with control valves which permit the trimming of the flue gas mass flows between the flue gas control passes.
The invention therefore provides in its embodiment that the reheater control pass component and/or the high-pressure superheater control pass component is arranged in the area of the boiler hood underneath the boiler roof.
Also provided by the invention is an especially favourable, space-saving arrangement and design of the flue gas duct with the formation of a control pass, which can be achieved by arranging the high-pressure superheater control pass component next to or underneath the reheater control pass-component and also, if necessary, partially in the area of the boiler hood.
Here it can be appropriate that the size of the flue gas duct designed for a single-pass boiler without a control pass be subdivided in the ratio of the size of the flue gas control passes of 70:30 to 30:70, in particular in the ratio 50:50, for the reheater control pass component and the high-pressure superheater control pass component.
An appropriate embodiment of the invention is then further characterised by the fact that the reheater control pass component and the high-pressure superheater control pass component, arranged at least in certain sections in a parallel stacked and abutting arrangement or an adjacent and abutting arrangement, form the flue gas duct. In this manner, the N\Melbourne\Casea\Patent\72000-72999\P72354.AU\SpeCis\P72354.AU. Gi SPECIFICATION.doc 11/07/07 10 contemplated 70:30 to 30:70, and especially 50:50, subdivision of the flue gas duct volume originally designed for a singlepass boiler without a control pass can be successfully implemented.
In order to be able to exert a selective influence and control (1 over the flue gas velocity, in particular to increase the speed and thus prevent ash deposition, the invention further contemplates that the reheater control pass component, in comparison to the adjacent area formed in the boiler body of the reheater control pass, possesses at least in certain sections a smaller width in the form of a constriction. By this means, i.e.
the size of the (duct) constriction, the flue gas velocities in this part of the flue gas duct or the reheater control pass component can easily be increased. A deposition of ash in this horizontal section of the flue gas duct is prevented in the upper load range of the boiler by means of this design. Ash deposited in the part-load range is discharged again on increasing to higher loads.
This is also contributed to by a duct division.in the flue gas duct, which is formed into the shape of a duct division element and is arranged centrally in relation to the width of this flue gas duct section. This duct division extends over the entire height of the flue gas duct section formed from the reheater control pass component and, as shown below, if necessary also the high-pressure superheater control pass component. The invention is therefore further characterised in that, in one longitudinal axis of the constricted area, a duct division element is arranged.
In the embodiment, it is then further appropriate for louvre dampers to be arranged in the reheater control pass, in particular in the repeater control pass component. Depending on the width of the flue gas duct, a horizontal or vertical arrangement of the louvre dampers may be used for control in the Ns \Melbourne\Casea\Patent\72000-72999\P72354 .AU\Specie\P72354 AU. GH SPECIFICATION.doc 11/07/07 11 reheater control pass. However, the vertical arrangement of the louvre dampers has shown itself to be particularly appropriate, especially for larger boiler widths, such that the invention is further characterised by the fact that, in the reheater control pass component, the louvre dampers are arranged vertically with a swivel axis aligned parallel to the boiler body's longitudinal (1 axis.
Due to the embodiment according to the invention of the stacked or adjacent flue gas duct sections, which are once formed from the reheater control pass component and once from the highpressure superheater control pass component, and due to the arrangement of the high-pressure superheater control pass allocated to the exhaust side, no additional flue gas duct is required to trim the flue gas mass flows in the high-pressure superheater range, but rather it can be formed from a flue gas duct designed from a single-pass boiler without a control pass by corresponding separation in the flue gas duct section (located above or, for example, to the right) for the flue gas from the reheater control pass and a section (located below or, for example, to the left) for the flue gas from the highpressure superheater control pass.
Due to the embodiment of the stacked or adjacent flue gas duct sections, whereby at least the reheater control pass component also extends into the upper area of the boiler hood and the reheater control pass component and the below or adjacent part of the high-pressure superheater control pass component are only separated by a dividing wall, the boiler hood designed from a single-pass boiler without a control pass and the connected flue gas duct can be used merely by the formation of a corresponding subdivision without an additional flue gas duct and without additional overall height of the boiler in order to implement a multipart control pass. In order to be able to perform a favourable setting of the flue gas velocities even in the section of the flue gas duct formed from the high-pressure superheater control pass component, this flue gas duct part or section is also equipped with a lateral constriction. The N \Melbourne\Cases\Patent\72000-72999\P72354.AU\Specis\P72354.AU. GM SPECIFICATION.doc 11/07/07 12 invention further provides that the high-pressure superheater control pass component, in comparison to the adjacent area formed in the boiler body of the high-pressure superheater control pass, possesses at least in certain sections a smaller width in the form of a constriction.
C' Advantageously, in this area/section of the flue gas duct, and also on one longitudinal axis of the flue gas duct, a duct division element is arranged, and on both sides of the duct division element which divides the duct, horizontal louvre dampers are arranged. The invention is therefore further characterised in an advantageous embodiment in that, in one longitudinal axis of the constricted area of the high-pressure superheater control pass component, a duct division element is arranged. The invention further provides that, in the highpressure superheater control pass, in particular in the highpressure superheater control pass component, louvre dampers are arranged, and, according to a further embodiment of the invention, in the high-pressure superheater control pass component, the louvre dampers are arranged horizontally with a swivel axis oriented transversely to the boiler body's longitudinal axis.
Since the duct division elements in the two sections of the flue gas duct that are above one another, which are formed once of the reheater control pass component and once of the highpressure superheater control pass component, are arranged vertically over one another, it is also possible to form a column of duct division elements which extends in its height through both flue gas duct sections.
The end of the respective duct division element or elements facing away from the flue gas flow direction is located at the end of the constriction of the respective flue gas duct section, such that, connected to it, the flue gas duct expands again to the original entry width of the two flue gas duct sections.
N.\elbourne\Caes\Patent\72000-72999\P72354.AU\Specis\P72354.AU. GH SPECIFICATION.doc 11/07/07 13 For control in the high-pressure superheater control pass component, depending on the duct width, both horizontally and vertically arranged louvre dampers may be used but, as stated above, the louvre dampers are advantageously arranged vertically according to the invention. Since the louvre dampers advantageously extend on each side of the duct division element CI in the high-pressure superheater control pass component and this is also the area of the constriction of this flue gas duct section, the necessary width or length of the flue gas valves is reduced to a size which is favourable to the design and easy to control.
To reduce the control valve span and improve the control characteristics of the control valves, the duct is drawn in laterally in the area of the valves in the case of a horizontal valve arrangement and large boiler widths in the high-pressure superheater control pass and the reheater control pass. In the case of excessively large duct widths, the flue gas duct is, for the same reasons, preferably and advantageously divided in the centre on the longitudinal access of the flue gas duct. In the area of the .duct division, the control valves of the highpressure superheater control pass are arranged in the form of louvre dampers (which are preferably horizontal) on both sides of the duct division. Through the lateral constriction and central duct division of the high-pressure superheater control pass component, in the case of large spans, the cantilevered length of the louvre dampers can be reduced according to the division. For control in the high-pressure superheater control pass, depending on the duct width, both horizontally and vertically arranged louvre dampers may be used but, as stated above, the louvre dampers are advantageously arranged vertically according to the invention.
Located in the flue gas flow direction behind the duct division element is the end of the control pass division, such that, N.\Melbourne\Caoes\Paten t\72000 O-72999\72354.AU\Speci\P72354.AU. GH SPECIFICATION.doc 11/07/07 14 connected to it, the flue gas duct expands again to the original entry width of the two flue gas duct sections.
Finally, the above object is also achieved by a method in which the method mentioned initially is characterised by the fact h that, by means of a dividing wall in the flue gas pass in a C section with high-pressure superheater heating surfaces, a high- 0 pressure superheater .control pass with a high-pressure superheater control pass flue gas flow and in a section with reheater heating surfaces separated from it, a reheater control pass with a reheater control pass flue gas flow is formed, these flue gas flows are fed separately through a high-pressure superheater control pass component and a reheater control pass component of a flue gas duct respectively, and by means of control valves arranged in them, the respective flue gas mass flow is adjusted in the high-pressure superheater control pass and reheater control pass.
In this way, the same advantages are achieved as shown above in relation to the single-pass boiler.
In exemplary fashion, the invention is explained in more detail below by means of the illustration. This shows in: Fig. 1 a schematic sectional view through a single-pass boiler according to the invention, Fig. 2 a schematic representation of a plan view of a reheater control pass component, and in Fig. 3 a schematic plan view inside a high-pressure superheater control pass component.
Fig. 1 shows a single-pass boiler designated by the reference number 1, which has a furnace or burner room 2, arranged above it a flue gas pass 3 and connected to it a divided flue gas duct N \Melbourne\Caaes\Patent\72000-72999\P72354.AU\Specio\P72354.AU. CH SPECIPICATION.doc 11/07/07 15 4 with a following shared flue gas pipe 5. Since it is a singlepass boiler 1, in the flue gas pass 3 through which the flue gas flows, the following are arranged above one another: a first superheater (HP heat exchanger or heating surfaces UE1) 6; a second superheater (HP heat exchanger or heating surfaces UE3) 7 and a first reheater (RH heat exchanger or heating surfaces RH2) (CN 8. Above the first reheater 8, the flue gas pass 3 is divided by 0 a cooled dividing wall 9 into a reheater control pass 10 and a high-pressure superheater control pass 11. In the reheater control pass 10, a second reheater (RH heat exchanger or heating surfaces RH1) 12 and an economiser (HP heat exchanger or heating surfaces EC02) 13 are arranged. At the same level, in the highpressure superheater control pass 11, a third superheater (HP heat exchanger or heating surfaces UE2) 14 and a second economiser (HP heat exchanger or heating surfaces ECO1) 15 are arranged. The superheater, reheater and economiser 6-8, 12-15 are formed as normal convection surfaces and constitute the heat exchanger bundles of the single-pass boiler.
The reheater control pass 10 flows in the area of the boiler hood 16 into a reheater control pass component 18 arranged underneath the boiler roof in a horizontal position and forms, with this area, an upper part of the flue gas duct 4. The reheater control pass component 18 is equipped on its underside with an uncooled dividing wall 19 which extends the dividing wall 9, which separates the reheater control pass component -18 from the high-pressure superheater control pass component which lies beneath it and, at least in certain sections, forms the lower part of the flue gas duct 4, and with this component 20 the high-pressure superheater control pass 11 forms an area of the flue gas duct 4. Into the high-pressure superheater control pass component 20 flows the high-pressure superheater control pass 11, which is formed in the boiler body as part of the flue gas pass 3 and is delimited within the boiler body by the cooled dividing wall 9 with the upward connecting partial section of the uncooled dividing wall 19 facing the reheater ?J\Melbourne\Cases\Patent\72000-72999\P723S .AU\Specio\P72354 AU. OH SPECIFICATION.doc 11/07/07 16 (Z control pass 18, whereby the lateral limits of opposite side walls of the boiler body are formed. At the end of the flue gas duct 4, the flue gas flow leaves the reheater control pass component 18 and/or the high-pressure superheater control pass component 20, reaches a flue gas mixer 21 and is then reintegrated into a flow and drained off in the flue gas pipe 1 The flue gas flow within the single-pass boiler 1 is indicated by arrows. The arrows shown outside the burner room 2 symbolise the burners and the air supply. In the front area of the reheater control pass component 18 in the flow direction of the flue gas, vertically standing control valves 22 are arranged in the entry area of this flue gas duct section. The swivel axis of the control valves 22 is aligned parallel to the longitudinal axis of the single-pass boiler i. Also located in the area or section of the flue gas duct formed by the high-pressure superheater control pass component 20 are 4 control valves 23, which are adjustable horizontally about a swivel axis arranged transversely to the longitudinal axis of the single-pass boiler i.
Overall, in this way a single-pass boiler 1 is formed which includes a reheater control pass 10 and a high-pressure superheater control pass 11, which extend along the upper area of the flue gas pass 3 to the area of the boiler hood 16 and the outgoing flue gas duct 4 to the area of the flue gas mixer 21, whereby these control passes are formed such that each of the control pass components 18, 20 with adjustable valves 22, 23 are formed in the area which, in a single-pass boiler without a control pass, forms the outgoing flue gas duct 4. However, the reheater control pass component 18 extends into the area which, in single-pass boilers without a control pass, is spanned by the boiler hood 16 and indeed it extends to half of the width B1 of the single-pass boiler 1. In the embodiment in question, the existing flue gas duct space is now completely filled by the reheater control pass component 18 and the high-pressure superheater control pass component 20, namely in a parallel N.\Melbourne\Caoes\Patent\72000.72999\P72354.AU\Specia\P72354.AU. GH SPECIPICATION.doc 11/07/07 17 overlapping manner, whereby each of the two control pass components 18, 20 preferably fills approx. 50% of the originally available or designed flue gas duct space, i.e. a proportion of 50:50 is achieved. Moreover, in the embodiment in question, the area of the boiler hood 16 is also completely filled by the inward protrusion of the reheater control pass component 18 with (N the adjacent reheater control pass area as well as the adjoining high-pressure superheater control pass area. Due to the fact that the control valves 22, 23 are arranged underneath the boiler roof 17 in the area of the boiler hood 16 (control valves 22) or in the flue gas duct 4 (control valves 23), it is not necessary to provide control valves above the economiser heating surfaces 13, 15 which would enlarge the boiler, i.e. increase its overall height. It is therefore possible to equip a singlepass boiler with a control pass for reheater steam temperature control with a valve and flue gas duct arrangement necessary for this, in which the overall height of the boiler compared to a boiler without a control pass is not increased or only negligibly increased.
The. high-pressure superheater heating surfaces of the third superheater (UE2) 14 are arranged on the flue gas side exhaust side of the flue gas pass 3, such that the high-pressure superheater control pass component 20 of the high-pressure superheater control pass 11 is arranged underneath the reheater control pass component 18 in the flue gas duct 4.
To achieve a favourable incoming flow to the valves and to prevent the deposition of ashes in front of the control valves 22, 23 the transition area of the walls forming the floor surface of the flue gas duct components 18 and 20 is in the form of chamfers 24, 25. However, any other embodiment of the redirection is also possible, for example the chamfer can be eliminated, it can have a rounded shape, etc.
N.\Melbourne\Cases\Patent\72000-72999\P72354.AU\Specis\P72354.AU. GH SPECIPICATION.doc 11/07/07 18 As can be seen in particular from Fig. 2, the reheater control pass component 18 possesses a lateral constriction 26, and in this area the width of the reheater control pass component 18 is reduced in comparison to the width of the original reheater control pass 10. In addition to this lateral, horizontal width reduction in the form of a constriction 26, it is also possible, (Ni in a manner not illustrated, to provide for a height reduction in the form of a vertical constriction. Overall, in this way in this area the flue gas velocity and consequently the flue gas mass flow is increased such that, in the upper load range, the deposition of ash in the duct-shaped reheater control pass component 18 is prevented and ash which has been deposited in the part-load range in the duct-shaped reheater control pass component 18, is discharged again on increasing to higher loads, i.e. it is carried away by the flue gas (mass) flow.
The central duct constriction of the flue gas duct 4 for the limitation of the valve spans of the valves 23 in the highpressure superheater control pass component 20 (fig.3), which is formed in the embodiment in question in the form of the duct division element 29, is also implemented in the reheater control pass component 18 (Fig. i.e. over the entire duct height of the flue gas duct 4. In this way, a sufficient cooling of the valve bearing of the high-pressure (HP) control valves 23 is ensured, since the inside of the duct division elements 27, 29 and the lateral outside of the flue gas duct 4 are freely connected to the external environment, i.e. the external atmosphere is applied there on the outside of the flue gas duct 4. If a cooling of the valve bearing is not required, then it is sufficient to have a central duct division in the form of the duct division element 29 in the high-pressure superheater control pass component 20. If the valves 22 of the reheater control pass component 18 are also arranged horizontally, then in the case of large spreads, for the reheater control pass component 18, a central duct division in the form of the duct division element 27 may also be necessary.
N \Melbourne\Cases\Patent\72000-72999\P72354.AU\Specis\P72354.AU. G1 SPECIFICATION.doc 11/07/07 19 In the flue gas flow direction behind the duct constriction 26, the control pass dividing wall 19 ends and the duct division into components 18 and 20 is eliminated. The constrictions 26 are removed, and the flue gas duct 4 returns to its original full width.
(cN The also duct-shaped high-pressure superheater control pass component 20 of the high-pressure superheater control pass 11, which is shown in Fig. 3, shows in this example, in the area of the control valves 23, a lateral constriction 28, and in the form of the duct division element 29, a central constriction. In the flue gas flow direction behind the new duct expansion, the control pass dividing wall 19 ends and the duct division into components 18 and 20 to form the control pass is eliminated. The constrictions 28 are removed, and the flue gas duct 4 returns to its full width.
Due to the lateral constriction 28 and the central constriction of the flue gas duct component 20 formed in this area by the duct division element 29, the control valves 23 arranged in this area only need to span one span from one-side surface of the central duct constriction (29) to the opposite duct wall of the duct-shaped high-pressure superheater control pass component as a result of which the span is reduced to a size which can be obtained without design problems. In a manner not shown, the duct-shaped high-pressure superheater control pass component in addition to the lateral constriction, can have a constriction which reduces the duct flow cross-section surface in a direction vertical to it.
The control valves 22, 23 are designed as so-called louvre dampers but, depending on the installation location, other valves, e.g. flap valves, can also be used.
N.\Melbourne\Caees\Patent\720OQ-72999\P72354 .AU\Specie\P72354.AU. GH SPECIPICATION.doc 11/07/07 20 The width B 18 of the constriction 26 is, in this embodiment, designed to be exactly the same length as the width B 20 of the constriction 28, such that the constricted duct-shaped control pass components 18,20 form the flue gas duct 4 in a flush overlapping position, whereby the remaining areas of the control pass components 18 and 20, i.e. the outer duct walls or (C demarcation walls, are also flush and overlapping each other.
The duct division elements 27 and 29 are also flush and in an
(N
overlapping position, so that they can if necessary also be formed in one piece as a subassembly. However, other design variants, e.g. a duct division only in the reheater control pass component or only in the high-pressure superheater control pass component, are also conceivable. The interior of the duct division elements is freely connected to the external environment of the flue gas duct.
The cooled dividing wall 9 in the heat exchanger area can be implemented without additional collector and connection pipes.
The dividing wall 9 is formed from the vertical piping of the front wall (or back wall) of the single-pass boiler 1. For this purpose, a part of the pipes is bent out from the front wall (or back wall) to form the dividing wall 9 and fed as an open grid underneath the third superheater (UE2) 14 up to the entrance in the dividing wall 9. Above the economiser 15, the pipes of the dividing wall 9 are fed back as an open grid 31 into the corresponding front wall (or back wall) from which they were taken. The dividing wall 9 is continued beyond this area above the heating surfaces as an uncooled dividing wall 19. Therefore, to form the dividing wall 9, 19 required for the control pass, no additional collector or connection pipes are necessary, The upright/vertical arrangement of the inter-crossing dividing walls 9 and 19 extends above the furnace or burner room 2 in the flue gas pass 3 from above the level of the third superheater (RH2) 8 over the level of the third superheater of the (UE2) 14 and the second reheater (RH1) 12 and over the area of the N\Melbourne\Casea\Patent\72000-72999\P72354.AU\Speci\P72354.AU. GH SPECIPICATION.doc 11/07/07 21 economiser 13 and 15 up to the area of the flue gas duct 4 and ends in around one half the height of the flue gas duct 4 with a transition into the chamfers 24 and continuation of the dividing wall 19 in a horizontal arrangement forming the floor area of the duct-shaped reheater control pass component 18 and the roof area of the duct-shaped high-pressure superheater control pass component 20, depending on the 'division into around a half height of the flue gas duct 4 behind the (HP superheater) control valves 23. The height is guided by the size division provided between the HP (high pressure) und RH (reheater) control pass, which shows a size ratio of between 70:30 and 30:70, in particular 50:50.
Even if, in the above embodiment, the flue gas pass 3 is subdivided by the dividing wall 9 into a high-pressure superheater control pass 11 and a reheater control pass other arrangements of the heating surface bundles 6-8, 12-15 are also possible. Embodiments of the invention include all conceivable overlapping positions of the heating surfaces.
According to the invention, it is only necessary to divide the flue gas pass 3 with the aid of at least one dividing wall 9 into two subareas,- at least one of which is controllable and the control valves are preferably formed in the cross-running exhaust-gas duct 4 or in a cross-running exhaust-gas duct in the area of the boiler hood 16, and both subareas are fed separately in the exhaust-gas duct 4, whereby the exhaust-gas duct and the boiler hood 16 are formed or must be formed so as to be no larger than in a single-pass boiler without a control pass. The cooled dividing wall 9 can also extend as far as the boiler roof 17, formed as a grid in the area 30 of the reheater control pass component 18 and/or extend over a larger number of heating surfaces arranged.'in an overlapping manner.
In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word Ns \Melbourne\Cases\Patent\72000-72999\P72354 .AU\Specie\P723S4 AU. GH SPECIFICATION.doc 11/07/07 22 "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
It is to be understood that, if any prior art publication is C1 referred to herein, such reference does not constitute an 0 admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
N.\Melbourne\Cases\Patent\72000-72999\P72354.AU\Specis\P72354.AU. GH SPECIFICATION.doc 11/07/07
Claims (14)
1. Single-pass boiler with a flue gas duct arranged above the heat-exchange surface, preferably designed as a cross-pass at least in certain sections, with an adjacent 0 flue gas pipe and with at least one dividing wall Cl 19) arranged above the furnace in the flue gas pass 0 and extending into the area of the flue gas duct, which delimits at least one control pass with at least one O 10 associated control valve (22, 23), characterised in that at least one dividing wall 19) subdivides the flue gas pass into at least two separate control passes (10, 11), each of which possesses, at least in sections, the areas forming the flue gas duct whereby at least one control pass (10, 11) is allocated to at least one control valve (22, 23).
2. Single-pass boiler according to claim 1, characterised in that the area having at least one dividing wall 19) in the flue gas pass with high-pressure superheater heating surfaces (14) is separated .from the area having reheater heating surfaces (12) with the formation of a high- pressure superheater control pass (11) and a reheater control pass whereby the high-pressure superheater heating surfaces (14) are preferably arranged on the flue gas side exhaust side of the flue gas pass which is turned towards the flue gas duct and the flue gas duct is divided, at least in certain areas, into a reheater control pass component (18) and a high-pressure superheater control pass component
3. Single-pass boiler according to claims 1 or 2, characterised in that the reheater control pass component (18) and/or the high-pressure superheater control pass component (20) is arranged in the area of the boiler hood (16) underneath the boiler roof (17). N \Melbourne\Cases\Patent\72000-72999\P72354 .AU\Specis\P72354 AU. GH SPECIFICATION.doc 11/07/07 24
4. Single-pass boiler according to one of the previous claims, characterised in that the high-pressure superheater control pass component (20) is arranged adjacent to or below the reheater control pass component (18). C(
5. Single-pass boiler according to one of the previous 0 claims, characterised in that the reheater control pass component (18) and the high-pressure superheater control pass component arranged at least in certain sections in a parallel overlapping and abutting arrangement or an adjacent and abutting arrangement, form the flue gas duct
6. Single-pass boiler according to one of the previous claims, characterised in that the reheater control pass component in comparison to the adjacent area formed in the boiler body of the reheater control pass possesses, at least in certain sections, a smaller width (B 18 in the form of a constriction (26)
7. Single-pass boiler according to claim 6, characterised in that in one longitudinal axis of the constricted area a duct division element (27) is arranged.
8. Single-pass boiler according to one of the previous claims, characterised in that in the reheater control pass in particular in the reheater control pass component louvre dampers (22) are arranged.
9. Single-pass boiler according to claim 8, characterised in that in the reheater control pass component the louvre dampers (22) are arranged vertically with a swivel axis parallel to the longitudinal axis of the boiler body.
N: \Melbourne\Cases\Paent\7200-72999\P72354.AU\Specis\P72354.AU. GH SPECIPICATION.doc 11/07/07 25 Single-pass boiler according to one of the previous claims, characterised in that the high-pressure superheater control pass component in comparison to the adjacent area formed in the boiler body of the high-pressure superheater control pass possesses, at least in certain sections, a smaller width (B 20 in the form of a Cr constriction (28). (Nc
11. Single-pass boiler according to claim 10, characterised 9 10 in that in one longitudinal axis of the constricted area a duct division element (29) is arranged.
12. Single-pass boiler according to one of the previous claims, characterised in that in the high-pressure superheater control pass in particular in the high- pressure superheater control pass component louvre dampers (23) are arranged.
13. Single-pass boiler according to claim 12, characterised in that in the high-pressure superheater control pass component the louvre dampers (23) are arranged horizontally with a swivel axis oriented transversely to the longitudinal axis of the boiler body.
14. Method for controlling the temperature of the steam exhaust temperature of the reheater heating surfaces (8,12) by trimming the flue gas mass flow of a flue gas pass above the furnace of a single-pass boiler characterised in that, by means of a dividing wall (9,19) in the flue gas pass in an area showing high-pressure superheater heating surfaces a high-pressure superheater control pass (11) with a high-pressure superheater control pass flue gas flow and in an area showing reheater heating surfaces (12) separated from it, a reheater control pass (10) with a reheater control pass flue gas flow is formed, these flue gas flows are fed separately N \Melbourne\Cases\Patent\72000-7999\P72354 .AU\Specie\P72354.AU. GH SPECIICATIONdoc 11/07/07 26 through a high-pressure superheater control pass component and a reheater control pass component (18) of a flue gas duct respectively, and by means of control valves (22,23) arranged in them, the respective flue gas mass flow is adjusted in the high-pressure superheater control pass (11) and reheater control pass (Nc 0q 0D N \Melbourne\Casee\Patent\72000-72999\P72354.AU\Specil\P72354.AU. GH SPECIFICATION.doc 11/07/07
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006048538.6-42 | 2006-10-13 | ||
| DE200610048538 DE102006048538A1 (en) | 2006-10-13 | 2006-10-13 | Single pass boiler or single pass extraction steam generator, has separation walls dividing flue gas string into standard strings with areas forming flue gas channel, where one string is attached to control butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2007203229A1 true AU2007203229A1 (en) | 2008-05-01 |
Family
ID=39184925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2007203229A Abandoned AU2007203229A1 (en) | 2006-10-13 | 2007-07-11 | Single-pass boiler with control pass |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1985918A3 (en) |
| AU (1) | AU2007203229A1 (en) |
| DE (1) | DE102006048538A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102809167A (en) * | 2011-06-03 | 2012-12-05 | 何秀锦 | Boiler with automatic ash cleaning function |
| CN103574588A (en) * | 2013-11-29 | 2014-02-12 | 哈尔滨锅炉厂有限责任公司 | Tower-type boiler capable of regulating temperature by combined utilization of secondary reheating damper regulator and smoke recirculation |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666485B (en) * | 2009-08-25 | 2011-04-13 | 南通万达锅炉股份有限公司 | Double-inlet double-flue modular afterheat boiler |
| WO2019119384A1 (en) * | 2017-12-21 | 2019-06-27 | 深圳市能源环保有限公司 | Steam reheating system for rubbish incineration furnace |
| CN108036298A (en) * | 2017-12-21 | 2018-05-15 | 深圳市能源环保有限公司 | A kind of garbage burning boiler steam reheat system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB662721A (en) * | 1948-10-25 | 1951-12-12 | Comb Eng Superheater Inc | Improvements in or relating to a steam generator |
| GB772566A (en) * | 1954-05-03 | 1957-04-17 | Siemens Ag | Improvements in or relating to steam boilers having a single stage reheater or multiple stage reheaters convectively heated by flue gas |
| US2984984A (en) * | 1954-06-25 | 1961-05-23 | Bailey Meter Co | Vapor generation and superheating |
| GB807282A (en) * | 1956-05-08 | 1959-01-14 | Babcock & Wilcox Ltd | Improvements in tubulous vapour generating and vapour heating units |
-
2006
- 2006-10-13 DE DE200610048538 patent/DE102006048538A1/en not_active Withdrawn
-
2007
- 2007-07-11 AU AU2007203229A patent/AU2007203229A1/en not_active Abandoned
- 2007-10-09 EP EP07118092A patent/EP1985918A3/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| WO2012135987A1 (en) * | 2011-04-07 | 2012-10-11 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102230614B (en) * | 2011-04-07 | 2012-11-14 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102809167A (en) * | 2011-06-03 | 2012-12-05 | 何秀锦 | Boiler with automatic ash cleaning function |
| CN103574588A (en) * | 2013-11-29 | 2014-02-12 | 哈尔滨锅炉厂有限责任公司 | Tower-type boiler capable of regulating temperature by combined utilization of secondary reheating damper regulator and smoke recirculation |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1985918A2 (en) | 2008-10-29 |
| EP1985918A3 (en) | 2009-09-30 |
| DE102006048538A1 (en) | 2008-04-17 |
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Legal Events
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| MK4 | Application lapsed section 142(2)(d) - no continuation fee paid for the application |